Aukuma: I don't know about the mite thing, but have a call in to our County Extension office about turkeys as I too am considering hatching them out. I've been told that if 'blackhead' is prevalent with chickens in your area that you should not mix them with your poults. Also, I've heard that having turkeys in with your chickens can decrease or eliminate Mareks, sooooo.... Still waiting on the callback from the extension office on these two issues.
Blarneyeggs are you part of the facebook group for the chickenstock? If not you can be added here: https://www.facebook.com/groups/314496961938682/
I've heard mixed stories too.